Convert array of objects to array of arrays?

Question

Given is an json object like this:

var items = [{
    title: 'sample 1',
    image: 'http://www.lorempixel.com/700/600/'
}, {
    title: 'sample 2',
    image: 'http://www.lorempixel.com/900/1200/'
}, {
    title: 'sample 3',
    image: 'http://www.lorempixel.com/400/300/'
}, {
    title: 'sample 4',
    image: 'http://www.lorempixel.com/600/600/'
}, {
    title: 'sample 5',
    image: 'http://www.lorempixel.com/400/310/'
}, {
    title: 'sample 6',
    image: 'http://www.lorempixel.com/410/300/'
}, {
    title: 'sample 7',
    image: 'http://www.lorempixel.com/500/300/'
}, {
    title: 'sample 8',
    image: 'http://www.lorempixel.com/300/300/'
}, {
    title: 'sample 9',
    image: 'http://www.lorempixel.com/450/320/'
}, {
    title: 'sample 10',
    image: 'http://www.lorempixel.com/500/400/'
}];

I Want to get an array like this.

[['sample 1', 'http://www.lorempixel.com/700/600/'], ['sample 2', 'http://www.lorempixel.com/900/1200/'], ....]

I tried something like this:

const rows = [];
            for (let i = 0; i < items.length; i++) {
                const element = items[i];
                rows[i] = element.title;
                for (let j = i; j < items.image; j++) {
                    const el = response[j];
                    rows[j] = el.image;
                }
            }

I get an array containing only all images, i think because i override other values in the second loop. What should be the right way to get both values like described ?

Mohammad Usman · Accepted Answer · 2018-11-10 06:37:58Z

2

Simply pass Object.values() as callback to .map():

let data = [
  {title: 'sample 1', image: 'http://www.lorempixel.com/700/600/'},
  {title: 'sample 2', image: 'http://www.lorempixel.com/900/1200/'},
  {title: 'sample 3', image: 'http://www.lorempixel.com/400/300/'},
  {title: 'sample 4', image: 'http://www.lorempixel.com/600/600/'},
  {title: 'sample 5', image: 'http://www.lorempixel.com/400/310/'}
];

let result = data.map(Object.values);

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

answered Nov 10, 2018 at 6:37

Mohammad Usman

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CertainPerformance · Accepted Answer · 2018-11-10 06:37:15Z

All you need is a simple .map - extract the appropriate property values from the object, and return an array containing those two values:

var items=[{title:'sample 1',image:'http://www.lorempixel.com/700/600/'},{title:'sample 2',image:'http://www.lorempixel.com/900/1200/'},{title:'sample 3',image:'http://www.lorempixel.com/400/300/'},{title:'sample 4',image:'http://www.lorempixel.com/600/600/'},{title:'sample 5',image:'http://www.lorempixel.com/400/310/'},{title:'sample 6',image:'http://www.lorempixel.com/410/300/'},{title:'sample 7',image:'http://www.lorempixel.com/500/300/'},{title:'sample 8',image:'http://www.lorempixel.com/300/300/'},{title:'sample 9',image:'http://www.lorempixel.com/450/320/'},{title:'sample 10',image:'http://www.lorempixel.com/500/400/'}];

console.log(
  items.map(({ title, image }) => [title, image])
);

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